convert //mash to std::unique_ptr

mash/wm/frame/move_event_handler.h

Index: mash/wm/frame/move_event_handler.h
diff --git a/mash/wm/frame/move_event_handler.h b/mash/wm/frame/move_event_handler.h
index 65851eca7f5fc871cc1a5d33f01bfc7e75f36eb9..b14017cfa087189b63b2f68587daf1c003c11c96 100644
--- a/mash/wm/frame/move_event_handler.h
+++ b/mash/wm/frame/move_event_handler.h
@@ -5,8 +5,9 @@
 #ifndef MASH_WM_FRAME_MOVE_EVENT_HANDLER_H_
 #define MASH_WM_FRAME_MOVE_EVENT_HANDLER_H_
 
+#include <memory>
+
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "ui/aura/window_observer.h"
 #include "ui/events/event_handler.h"
 
@@ -51,7 +52,7 @@ class MoveEventHandler : public ui::EventHandler, public aura::WindowObserver {
   mus::Window* mus_window_;
   aura::Window* aura_window_;
   aura::Window* root_window_;
-  scoped_ptr<MoveLoop> move_loop_;
+  std::unique_ptr<MoveLoop> move_loop_;
 
   DISALLOW_COPY_AND_ASSIGN(MoveEventHandler);
 };